/*
 * Copyright 2009 Mike Cumings
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.kenai.jbosh;

/**
 * Data type representing the getValue of the {@code accept} attribute of the
 * {@code bosh} element.
 */
final class AttrAccept extends AbstractAttr<String> {

	/**
	 * Array of the accepted encodings.
	 */
	private final String[] encodings;

	/**
	 * Creates a new attribute object.
	 * 
	 * @param val
	 *            attribute getValue
	 * @throws BOSHException
	 *             on parse or validation failure
	 */
	private AttrAccept(final String val) {
		super(val);
		encodings = val.split("[\\s,]+");
	}

	/**
	 * Creates a new attribute instance from the provided String.
	 * 
	 * @param str
	 *            string representation of the attribute
	 * @return attribute instance or {@code null} if provided string is
	 *         {@code null}
	 * @throws BOSHException
	 *             on parse or validation failure
	 */
	static AttrAccept createFromString(final String str) throws BOSHException {
		if (str == null) {
			return null;
		} else {
			return new AttrAccept(str);
		}
	}

	/**
	 * Determines whether or not the specified encoding is supported.
	 * 
	 * @param name
	 *            encoding name
	 * @result {@code true} if the encoding is accepted, {@code false} otherwise
	 */
	boolean isAccepted(final String name) {
		for (String str : encodings) {
			if (str.equalsIgnoreCase(name)) {
				return true;
			}
		}
		return false;
	}

}
